oe brooklyn



N. LEE.

SPAPK PLUG.

APPLICATION FILED JAN. 3. 1919.

lutentml (M. 28, 1919.

40 shown partly in'elevation;

' plu fiIXON LEE, 0F BROOKLYN, NEW YORK, I

I j srm-rnuo.

Application filed January 3,

T0 all whom it may concern:

Be it known that I, NIXON LEE, a citizen of the United States, and a resident of the borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and. useful Improvements in Spark-Plugs, of which the following is a specificatiom eference-being made'to the accompanying drawings, forming a part thereof. r

My invention relates used for explosive engines,

to spark-plugs be and the ob ects of my invention are, among other things, to form a spark-plug whichv may be readily taken apart for cleaning or other purposes, the parts of which may also be easily and compactly assembled togetherwith means to effectively seal such component parts under the aseous pressure of the engine cylin-. der, whi e maintaining the central electrode of the spark-plug in proper alinement. A further. object of my inven ion is to provide asimple, durable and inexpensive sparkwherein the gaseous pressure is d1- utilized to more-closely pack the sev rect y spark plu struceral parts comprising the ture so as to prevent leakage, there y furnishing an effective seal about the central position within the spark-plug body proper.

With the above and other objects in view,

my invention comprises thenovel construction, combination and arrangement of parts tion of the plug,

to be hereinafter specificall described and j set forth in the a pended eaims.

I attain these a vantageous results by the spark-plug shown in the accompanying drawings in whichv 0 Figure 1 is a vertical sectional-v ew of a preferred embodiment of my' mvention Fig. 2 is an'enlarged sectional plan viewtaken on the line 2-2 in F1g. 1;-

Fig. 3 'is an enlarged verticalfsectional view ofthe annular tapered bushing);

Fig. 4 is a top plan view of the ushing shownin Fig. 3; and Fi 5 is a diagrammatic vertical sectiona view showing the tapered bushing surrounding the central core within the depending screw-threaded flange of the nut which secures the core within the body porthe annular beading carried on the lower rim of holding the tapered bushing in position, be-

the nut flange for Specification m P t Patented 0a. 28', 1919. i

1919. Serial in. 209,505..

ing shown as it a pears before such beading is spun over as s own in Fig. 1. Similar numerals referto similar parts throughout the several figures.

Referring to Fig. 1, the spark-plu body or shell 6 is screw threaded at 7 by w 'ch it 1s mountedon the cylinder (not shown) of any explosive engine. -The upper portion of the body 6 is formed with ahollow bore 1 8 screw-threaded at 9 withwhich the nut 15 10 withits screw-threaded flange 11 coacts to secure the central insulated core 12 in position. The upper middle portion 13 of the core 12 is in the form of a truncated. cone the surface of which is adapted to fit within 7 P the inclined annular bore, or shoulder 14-.

a close fit when the nut 10, havingthe core I 12 depending within the flange 11, is

screwed down on the washer 15 of thespark pllg body 6 asshown in Fig. 1; Y L

ithin the flange 11' of-the nut 10 and surrounding the central core 12, which is somewhat tapered downwardly as shown im F1g's. 1 and '5, is placed the annular'tapered bushing 16,.preferably formed as shown in Flgs. 3 and 4; the thin top edge 17 of thebushing 16 extends upwardl intolthe-annular pocket 18, which is V-shaped in verti cal elevation, formed between the core 12 and the flange ll'asshown in Figs. 1 and 5. The lower rim of the flange 11 carries the annular beading'19 (shown in Fig. 5) which is adapted to be spun over to hold loosely the bushing 16 in placewithin the pocket 18 after the bushing 16 has been slipped-on the core 12 withinv the flange 11, yet such beadin 19 should not touch the outer surface 0 the/core 12 as shown in Fi 1, a narrow annular slot being left t erebe- The central core 12 is made ofporcelaiii,

mica or other insulatin material, and car- 9 The upper end 22 of the electrode is screw-threaded as shown in Fig. l and carries the binding nut 23 by which a wire or electric conduit may be connected. To the top of the core 12 I have fastened the nut 24 and screwed same down on the screwthreadedvend 22 of the electrode 20; over the nut 24 I have placed the cap 25 which is adapted to be fitted over and screwed down on the nut 24 to prevent the latter from rotating within the cap 25 and from loosening upon the end 22, owing to the slight eccentricities existing in the base of the nut 24 and the bore of the cap 25. By this means a tight fit is afforded for the Wire connections within the binding nut 28.

The operation of my improved sparlnplug is substantially as follows When the parts are in position as shown in Fig. 1, there is a close fit extending between the conical surface 13 of the core 12 and the inclined shoulder 14: of the nut 10 which is maintained by the nut 10 being screwed down Within the body 6 as shown in Fig. 1. However I also utilize the pressure of the engine cylinder to force upwardly and maintain in wedged position the tapered bushing 16 within the pocket 18, such gaseous pressure acting uniformly along the entire base of the bushing through the annular slot extending around the core 12 inside the bead ing19 as shown in Fig. 1. By this construction the bushing is not only pushed upwardly in the pocket 18 which is located just below the coacting surfaces 13 and 1% of the core 12 and nut 10 respectively to completely seal the union of the core and nut, but such bushing, acting like a wedge on all sides, also tends to hold the electrode 20 in proper alinement between theelectrodes 21 which is of considerable importance in preventing and reducing the carbon deposits on'such electrodes.

It is manifest that my spark-plug may be readily taken apart and assembled again in operative position, and that I have provided a spark-pin construction which embodies in itself great simplicity in structure while affording a double seal against leakages between central insulating core and the nut whichsecures same in position to the sparkplug'body. It will be understood that the spark-plug herein shown and described may be variously modified and changed without departing from the principle and scope of my invention, and that the principle as herein disclosed is applicable to spark plugs in positions other than that of being upright relatively to the engine cylinder walls.

' I claim as my invention 1. A spark plug for explosive engines comprisinga body attached to the engine cylinder, an insulated core centrally disposed within said body, separate means to secure said core to said body, and an annular tapered bushing permanently interposed between the core and securing means and maintained in wedging position therebetween by the pressure from the engine cylinder to seal the core to said securing means.

2. spark plug for explosive engines comprising a body attached to the engine cylinder, an insulated core centrally disposed Within said body, separate means to secure said core to said body, and an annular tapered bushing loosely but permanently in terposed between the core and securing means and maintained in wedging position therebetween by the pressure from the en gine cylinder to seal the core to said securing means.

3. A spark plug for explosive engines comprising a hollow body attached to the engine cylinder, an insulated core centrally disposed within said hollow body, a nut having a depending annular flange surrounding said core to secure the latter to said hollow body, the lower rim of the flange having an inwardly extending beading, and an annular bushing held within said flange about said core above the beading and maintained in wedging position therebetween by the pressure from the engine cylinder to seal the core and the nut against leakage.

4. A spark plug for explosive engines comprising a hollow body attached to the engine cylinder, an insulated core centrally disposed within said hollow body, a nut having a depending annular flange surrounding said core to secure the latter to said hollow body, the lower rim of the flange having an inwardly extending heading, and an annular tapered bushing held within said flange about said core above the heading and maintained in wedging position therebetween by the pressure from the engine cylinder to seal the core and the nut against leakage.

A spark plug for explosive engines comprising a hollow body attached to the engine cylinder, an insulated core centrally disposed within said hollow body, a nut having a depending annular flange surrounding said core to secure the latter to said hollow body, the lower rim of the flange having an inwardly extending beading, and an annular tapered bushing loosely held within said flange about said core above the beading and maintained in wedging position therebetween by the pressure from the engine cylin der to seal the core and the nut against bushing loosely held within said pocket by said flange and maintainable in wedged po-.

sition between said flange and core above the beading by the pressure from the engine cylinder to seal the core and nut agalnst leakage.

7. A spark plug for explosive engines comprising a hollow body attached to the engine cylinder, an insulated core centrally disposed within said hollow body, a hollow screw nut coa'cting with said body and surrounding said core to secure the latter to said hollow body, said nut having a depending annular flange artially surrounding said core, the lower rlm of the flange being formed with an inwardly extending beading leaving an annular opening between said beading and said core, and an annular bushing permanently held within said flange about said core above said annular opening and maintained in wedging position between the flange and core by the pressure from the engine cylinder to seal the core and nut against leakage.

8. A spark plug for explosive engines comprising a hollow body attached to the engine cylinder, an insulated core centrally disposed within said hollow body, a hollow screw nut coacting with said body. and surrounding said core to secure the latter to said hollow body, said nut having a'depending annular flange artially surrounding said core, the lower mm of the flange being formed with an inwardly extending beading leaving an annular opening between said beading and said core, and an annular tapered bushing permanently held within said flange about said core above said annular opening and maintained in wedging position between the flange and core by the pressure from the engine cylinder to seal the core and nut against leakage.

NIXON LEE. 

